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Pie de página de atribución CSS: fijo, centrado y transparente

HTML

<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Authentification - Vagues Liquides</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

body {
            font-family: 'Arial', sans-serif;
            height: 100vh;
            overflow: hidden;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            position: relative;
        }

.wave-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
        }

.wave {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 200%;
            height: 200px;
            background: linear-gradient(45deg, rgba(102, 126, 234, 0.8), rgba(118, 75, 162, 0.8));
            animation: wave-animation 10s ease-in-out infinite;
            opacity: 0.7;
        }

.wave:nth-child(2) {
            height: 150px;
            background: linear-gradient(45deg, rgba(118, 75, 162, 0.6), rgba(240, 147, 251, 0.6));
            animation: wave-animation 8s ease-in-out infinite reverse;
            opacity: 0.5;
        }

.wave:nth-child(3) {
            height: 100px;
            background: linear-gradient(45deg, rgba(240, 147, 251, 0.4), rgba(245, 87, 108, 0.4));
            animation: wave-animation 6s ease-in-out infinite;
            opacity: 0.3;
        }

.wave::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: inherit;
            border-radius: 50% 50% 0 0;
        }

@keyframes wave-animation {
            0%, 100% {
                transform: translateX(-50%) translateY(0px);
                border-radius: 40% 60% 70% 30%;
            }
            25% {
                transform: translateX(-60%) translateY(-10px);
                border-radius: 30% 70% 50% 50%;
            }
            50% {
                transform: translateX(-70%) translateY(-20px);
                border-radius: 60% 40% 30% 70%;
            }
            75% {
                transform: translateX(-40%) translateY(-10px);
                border-radius: 50% 50% 60% 40%;
            }
        }

.floating-elements {
            position: absolute;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

.bubble {
            position: absolute;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.05) 100%);
            border-radius: 50%;
            backdrop-filter: blur(5px);
            animation: bubble-float 8s ease-in-out infinite;
        }

.bubble:nth-child(1) {
            width: 60px;
            height: 60px;
            left: 10%;
            animation-delay: 0s;
        }

.bubble:nth-child(2) {
            width: 40px;
            height: 40px;
            left: 30%;
            animation-delay: 2s;
        }

.bubble:nth-child(3) {
            width: 80px;
            height: 80px;
            right: 20%;
            animation-delay: 4s;
        }

.bubble:nth-child(4) {
            width: 30px;
            height: 30px;
            right: 10%;
            animation-delay: 6s;
        }

@keyframes bubble-float {
            0%, 100% {
                transform: translateY(100vh) scale(0);
                opacity: 0;
            }
            10% {
                opacity: 1;
                transform: scale(1);
            }
            90% {
                opacity: 1;
                transform: scale(1);
            }
            100% {
                transform: translateY(-100px) scale(0);
                opacity: 0;
            }
        }

.container {
            position: relative;
            z-index: 10;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            padding: 20px;
        }

.auth-box {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(25px);
            border-radius: 30px;
            padding: 50px;
            width: 420px;
            box-shadow: 
                0 25px 50px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
            border: 1px solid rgba(255, 255, 255, 0.2);
            position: relative;
            overflow: hidden;
            animation: float-in 1s ease-out;
        }

@keyframes float-in {
            from {
                opacity: 0;
                transform: translateY(50px) scale(0.9);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

.auth-box::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(45deg, 
                rgba(255, 255, 255, 0.1) 0%, 
                rgba(255, 255, 255, 0.05) 50%, 
                rgba(255, 255, 255, 0.1) 100%);
            border-radius: 30px;
            animation: shimmer 3s ease-in-out infinite;
            pointer-events: none;
        }

@keyframes shimmer {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 1; }
        }

.logo-section {
            text-align: center;
            margin-bottom: 40px;
            position: relative;
            z-index: 2;
        }

.logo {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 50%, #fecfef 100%);
            border-radius: 50%;
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: white;
            font-weight: bold;
            animation: logo-pulse 2s ease-in-out infinite;
            box-shadow: 0 10px 30px rgba(255, 154, 158, 0.4);
        }

@keyframes logo-pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.1); }
        }

.logo-title {
            color: white;
            font-size: 2.2rem;
            font-weight: 300;
            margin-bottom: 8px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }

.logo-subtitle {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1rem;
            font-weight: 300;
        }

.tab-switcher {
            display: flex;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 25px;
            padding: 5px;
            margin-bottom: 35px;
            position: relative;
            z-index: 2;
        }

.tab-btn {
            flex: 1;
            padding: 15px 25px;
            background: none;
            border: none;
            color: rgba(255, 255, 255, 0.6);
            cursor: pointer;
            border-radius: 20px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            font-size: 1rem;
            font-weight: 500;
            position: relative;
            z-index: 3;
        }

.tab-btn.active {
            color: white;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
            transform: translateY(-1px);
        }

.form-wrapper {
            position: relative;
            z-index: 2;
        }

.form-panel {
            display: none;
            animation: slide-in 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

.form-panel.active {
            display: block;
        }

@keyframes slide-in {
            from {
                opacity: 0;
                transform: translateX(20px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

.input-group {
            margin-bottom: 25px;
            position: relative;
        }

.input-label {
            display: block;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 8px;
            font-size: 0.95rem;
            font-weight: 500;
        }

.input-field {
            width: 100%;
            padding: 18px 22px;
            background: rgba(255, 255, 255, 0.1);
            border: 2px solid rgba(255, 255, 255, 0.2);
            border-radius: 20px;
            color: white;
            font-size: 1rem;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            backdrop-filter: blur(10px);
        }

.input-field::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }

.input-field:focus {
            outline: none;
            border-color: rgba(255, 255, 255, 0.6);
            background: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }

.submit-button {
            width: 100%;
            padding: 18px;
            background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
            border: none;
            border-radius: 20px;
            color: white;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            text-transform: uppercase;
            letter-spacing: 1px;
            box-shadow: 0 15px 35px rgba(255, 154, 158, 0.4);
            position: relative;
            overflow: hidden;
        }

.submit-button::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            transition: all 0.3s ease;
            transform: translate(-50%, -50%);
        }

.submit-button:hover::before {
            width: 300px;
            height: 300px;
        }

.submit-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 20px 40px rgba(255, 154, 158, 0.5);
        }

.submit-button:active {
            transform: translateY(-1px);
        }

.extra-options {
            text-align: center;
            margin-top: 25px;
        }

.extra-link {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            font-size: 0.95rem;
            transition: color 0.3s ease;
        }

.extra-link:hover {
            color: white;
            text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
        }

.social-section {
            margin-top: 30px;
            text-align: center;
        }

.social-divider {
            position: relative;
            margin-bottom: 20px;
        }

.social-divider::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
        }

.social-divider span {
            background: rgba(255, 255, 255, 0.1);
            padding: 0 20px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
            backdrop-filter: blur(10px);
            border-radius: 15px;
        }

.social-buttons {
            display: flex;
            gap: 12px;
            justify-content: center;
        }

.social-btn {
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
            color: white;
            font-size: 1.2rem;
        }

.social-btn:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }
    </style>
</head>
<body>
    <div class="wave-container">
        <div class="wave"></div>
        <div class="wave"></div>
        <div class="wave"></div>
    </div>

<div class="container">
        <div class="auth-box">
            <div class="logo-section">
                <div class="logo">L</div>
                <h1 class="logo-title">Liquid</h1>
                <p class="logo-subtitle">Expérience fluide</p>
            </div>

<div class="tab-switcher">
                <button class="tab-btn active" onclick="showForm('login')">Connexion</button>
                <button class="tab-btn" onclick="showForm('register')">Inscription</button>
            </div>

<div class="form-wrapper">
                <div class="form-panel active" id="loginPanel">
                    <form>
                        <div class="input-group">
                            <label class="input-label">Adresse email</label>
                            <input type="email" class="input-field" placeholder="exemple@email.com" required>
                        </div>
                        <div class="input-group">
                            <label class="input-label">Mot de passe</label>
                            <input type="password" class="input-field" placeholder="Votre mot de passe" required>
                        </div>
                        <button type="submit" class="submit-button">Se connecter</button>
                    </form>
                    
                    <div class="extra-options">
                        <a href="#" class="extra-link">Mot de passe oublié ?</a>
                    </div>

<div class="social-section">
                        <div class="social-divider">
                            <span>ou continuez avec</span>
                        </div>
                        <div class="social-buttons">
                            <button class="social-btn">G</button>
                            <button class="social-btn">F</button>
                            <button class="social-btn">T</button>
                        </div>
                    </div>
                </div>

<div class="form-panel" id="registerPanel">
                    <form>
                        <div class="input-group">
                            <label class="input-label">Nom complet</label>
                            <input type="text" class="input-field" placeholder="Votre nom complet" required>
                        </div>
                        <div class="input-group">
                            <label class="input-label">Adresse email</label>
                            <input type="email" class="input-field" placeholder="exemple@email.com" required>
                        </div>
                        <div class="input-group">
                            <label class="input-label">Mot de passe</label>
                            <input type="password" class="input-field" placeholder="Créer un mot de passe" required>
                        </div>
                        <div class="input-group">
                            <label class="input-label">Confirmer le mot de passe</label>
                            <input type="password" class="input-field" placeholder="Répéter le mot de passe" required>
                        </div>
                        <button type="submit" class="submit-button">Créer un compte</button>
                    </form>

<div class="social-section">
                        <div class="social-divider">
                            <span>ou inscrivez-vous avec</span>
                        </div>
                        <div class="social-buttons">
                            <button class="social-btn">G</button>
                            <button class="social-btn">F</button>
                            <button class="social-btn">T</button>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>

// Reset all tabs
            tabButtons.forEach(btn => btn.classList.remove('active'));
            loginPanel.classList.remove('active');
            registerPanel.classList.remove('active');

if (formType === 'login') {
                loginPanel.classList.add('active');
                tabButtons[0].classList.add('active');
            } else {
                registerPanel.classList.add('active');
                tabButtons[1].classList.add('active');
            }
        }

// Animation des inputs
        document.querySelectorAll('.input-field').forEach(input => {
            input.addEventListener('focus', function() {
                this.parentElement.style.transform = 'translateY(-2px)';
            });
            
            input.addEventListener('blur', function() {
                this.parentElement.style.transform = 'translateY(0)';
            });
        });

// Effet de clic sur les boutons sociaux
        document.querySelectorAll('.social-btn').forEach(btn => {
            btn.addEventListener('click', function() {
                this.style.transform = 'scale(0.95)';
                setTimeout(() => {
                    this.style.transform = 'scale(1)';
                }, 150);
            });
        });
    </script>
</body>
</html>

CSS